railway DFCCIL Executive 2025 Mock Test Network Theory Two Port Networks Interconnection Two Port Networks
Two identical two-port networks having transmission matrix
\(\left[ {\begin{array}{*{20}{c}} A&B\\ C&D \end{array}} \right]\)
1
\(\left[ {\begin{array}{*{20}{c}} 2A&2B\\ 2C&2D \end{array}} \right]\)
2
\(\left[ {\begin{array}{*{20}{c}} A&B\\ C&D \end{array}} \right]\)
3
\(\left[ {\begin{array}{*{20}{c}} {{A^2} + BC}&{AB + BD}\\ {AC + CD}&{BC + {D^2}} \end{array}} \right]\)
4
\(\left[ {\begin{array}{*{20}{c}} {{A^2}}&{{B^2}}\\ {{C^2}}&{{D^2}} \end{array}} \right]\)